1 Vegapunk Vegapunk is undoubtedly the most intelligent person in the series. While his intelligence has not been tested in the midst of a battle, it is safe to assume that a person who is considered to be at least 500 years ahead of any other person would have no problem using it in battle.
Senku Ishigami is believed to possess an IQ of 180 to 200, making him a highly gifted being. He holds a profound knowledge of chemistry, mathematics, physics, biology, and all other subjects. Using his wide sense of knowledge, Senku has proved himself to be the savior of humanity multiple times.
Given the evidence, Luffy's IQ could easily be anywhere between 90 and 130. This would make his intelligence at least average and maybe a little above average, although not quite genius-level. His morality, choices, actions and accomplishments should say as much about him.
Vegapunk's original labs. Having used his vast knowledge to create lasers, giant robots, and the Thousand Sunny's puzzle like architecutre, Franky has to have the most intelligent mind of all the Straw Hats.
Franky - 170. he s full fledged all-round scientist, no competition here; Robin - 140.
1) Nico Robin
Nico Robin, however, is undoubtedly the smartest amongst the Straw Hat pirates. She's the only survivor of the island of Ohara, a people renowned for their general intelligence and academic capabilities.
Like his captain, Zoro isn't really intelligent. He's terrible at directions, even getting lost in their own ship, and prefers to just cut his way through. After all, he spent most of his life improving his sword and becoming the strongest swordsman.
Usopp remains to be the weakest member of the Straw Hat Pirates. In Wano, the vast majority of the members of the Straw Hat crew received good power-ups. However, Usopp was one of the members who did not receive any power-up and thus is lagging behind.
Zoro is perceived as the vice captain of the Straw Hats. He is arguably Luffy's most loyal crewmate. He has displayed the most respect and dedication to Luffy by following his orders, proclaiming promises, and being the most vocal about Luffy achieving his dream of becoming the Pirate King.
Goku: 76, even though you might think his IQ could be even lower sometimes, he often proves he can do some smart things too, especially while fighting and especially during DBZ.
Saitama (1000 IQ) VS 1.000. 000 Colossal Titans: 1.000 IQ, 100 IQ, 10 IQ!
2) Michael Kearney
Michael Kearney (born 1984) is a former child prodigy who set world records for being the youngest person to graduate and teach at a university. His IQ has been calculated at somewhere between 200 and 325.
1) Shikaku Nara
Shikaku Nara is arguably the smartest character in the Naruto series.
Sir Crocodile was the main antagonist of the Alabasta arc of the series and the first Shichibukai that Luffy took down. Crocodile is easily one of the most difficult fights that Luffy has ever fought as he lost to him twice. In fact, Luffy would've died both the times had luck not been on his side.
Against Shanks, even if Luffy possesses weaker Haki, the Devil Fruit abilities of the Hito Hito no Mi, Model: Nika can make up for the deficit and see him emerge victorious. Currently, however, Shanks is likely stronger than Luffy, simply due to the fact that the plot demands that of him.
Concerning his ethnic appearance, Oda revealed that he imagines Zoro to be of Japanese descent, albeit in a real-world context. Zoro has many scars on his body. The most noticeable is the long scar running down his left eye, which is the one he got after returning from the two-year time skip.
Yes, Zoro has a fear of stampeding naked men.
Luffy may not be the smartest character in One Piece, but he has almost unrivaled instincts and great emotional intelligence.
Over the years, he's faced adversity in many forms and overcome them with his many power-ups. Currently, Luffy is strong enough to fight the strongest of the Yonko in a one-on-one battle, making him extremely capable.
Marilyn vos Savant - Wikipedia.